Ricerc@Sapienza

Asexual taxa often have larger ranges than their sexual progenitors, particularly in areas affected by Pleistocene glaciations. The reasons given for this ‘geographical parthenogenesis’ are con- tentious, with expansion of the ecological niche or colonisation advantages of uniparental repro- duction assumed most important in case of plants. Here, we parameterized a spread model for the alpine buttercup Ranunculus kuepferi and reconstructed the joint Holocene range expansion of its sexual and apomictic cytotype across the European Alps under different simulation settings.

Demand for models in biodiversity assessments is rising, but which models are adequate for the task? We propose a set of best-practice standards and detailed guidelines enabling scoring of studies based on species distribution models for use in biodiversity assessments. We reviewed and scored 400 modeling studies over the past 20 years using the proposed standards and guidelines. We detected low model adequacy overall, but with a marked tendency of improvement over time in model building and, to a lesser degree, in biological data and model evaluation.

Aim
We sought to assess different megafaunal species responses to the intense climatic changes that characterized the end of the Quaternary.

Location
Eurasia.

Methods
We used species distribution modelling, niche overlap tests and co?occurrence analysis to model climatic niche evolution and change in six different megafauna species, including three extinct (woolly mammoth, woolly rhino and steppe bison) and three extant (red deer, wolf and reindeer) species.